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Financial Risk Management Objectives and Policies - Additional Information (Detail) - EUR (€)
€ in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

^[2]

Dec. 31, 2017

Statements [Line Items]

Cash and cash equivalents

€ 207,530

€ 103,353

^[1]

€ 39,367

€ 8,415

Historical volatility for shares, measurement input [member] | ARYA [Member] | Warrants [member]

Statements [Line Items]

Percentage of reasonable possible increase in unobservable inputs

10.00%

Percentage of resonably possible decrease in unobservable inputs

10.00%

Increase decrease in fair value measurement due to a reasonably possible increase in unobservable input recognized in profit or loss before tax liabilities

€ 1,700

Increase decrease in fair value measurement due to a reasonably possible decrease in unobservable input recognized in profit or loss before tax liabilities

€ 1,700

Foreign Exchange Rates [Member] | ARYA [Member] | Warrants [member]

Statements [Line Items]

Percentage of reasonable possible increase in unobservable inputs

10.00%

Percentage of resonably possible decrease in unobservable inputs

10.00%

Increase decrease in fair value measurement due to a reasonably possible increase in unobservable input recognized in profit or loss before tax liabilities

€ 1,900

Increase decrease in fair value measurement due to a reasonably possible decrease in unobservable input recognized in profit or loss before tax liabilities

(1,500)

Credit risk [member]

Statements [Line Items]

Maximum exposure to credit risk

232,000

119,000

Cash and cash equivalents

208,000

103,000

Other financial assets

24,000

€ 16,000

Currency risk [member] | Top of range [member]

Statements [Line Items]

Foreign exchange gain (loss)

10,900

Currency risk [member] | Bottom of range [member]

Statements [Line Items]

Foreign exchange gain (loss)

€ 13,200

Currency risk [member] | Euro [Member]

Statements [Line Items]

Percentage Of Reasonably Possible Decrease In Foreign Currency Risk

10.00%

Currency risk [member] | US [Member]

Statements [Line Items]

Percentage Of Reasonably Possible Increase In Foreign Currency Risk

10.00%

[1]	See Note 2 for details regarding the change in presentation of Other financial assets
[2]	See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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